Hi Manikanta, kernel test robot noticed the following build warnings:
[auto build test WARNING on robh/for-next] [also build test WARNING on arnd-asm-generic/master linus/master v6.17-rc7 next-20250926] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Manikanta-Guntupalli/dt-bindings-i3c-Add-AMD-I3C-master-controller-support/20250926-190033 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next patch link: https://lore.kernel.org/r/20250926105349.2932952-3-manikanta.guntupalli%40amd.com patch subject: [PATCH V8 2/5] asm-generic/io.h: Add big-endian MMIO accessors config: sparc64-defconfig (https://download.01.org/0day-ci/archive/20250927/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250927/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): include/uapi/linux/swab.h:19:12: note: expanded from macro '___constant_swab32' 19 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: In file included from arch/sparc/include/asm/io.h:7: In file included from arch/sparc/include/asm/io_32.h:21: include/asm-generic/io.h:787:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 787 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' 119 | ___constant_swab32(x) : \ | ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' 20 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: In file included from arch/sparc/include/asm/io.h:7: In file included from arch/sparc/include/asm/io_32.h:21: include/asm-generic/io.h:787:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 787 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' 119 | ___constant_swab32(x) : \ | ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' 21 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: In file included from arch/sparc/include/asm/io.h:7: In file included from arch/sparc/include/asm/io_32.h:21: include/asm-generic/io.h:787:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 787 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' 119 | ___constant_swab32(x) : \ | ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' 22 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: In file included from arch/sparc/include/asm/io.h:7: In file included from arch/sparc/include/asm/io_32.h:21: include/asm-generic/io.h:787:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 787 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32' 120 | __fswab32(x)) | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: In file included from arch/sparc/include/asm/io.h:7: In file included from arch/sparc/include/asm/io_32.h:21: include/asm-generic/io.h:803:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 803 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:818:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 818 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:833:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 833 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:926:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 926 | readsb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:939:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 939 | readsw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:952:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 952 | readsl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:966:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 966 | writesb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:980:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 980 | writesw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:994:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 994 | writesl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:1377:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 1377 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; | ~~~~~~~~~~ ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: >> arch/sparc/include/asm/io.h:16:9: warning: 'readw_be' macro redefined >> [-Wmacro-redefined] 16 | #define readw_be(__addr) __raw_readw(__addr) | ^ include/asm-generic/io.h:304:9: note: previous definition is here 304 | #define readw_be readw_be | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: >> arch/sparc/include/asm/io.h:17:9: warning: 'readl_be' macro redefined >> [-Wmacro-redefined] 17 | #define readl_be(__addr) __raw_readl(__addr) | ^ include/asm-generic/io.h:319:9: note: previous definition is here 319 | #define readl_be readl_be | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: >> arch/sparc/include/asm/io.h:19:9: warning: 'writel_be' macro redefined >> [-Wmacro-redefined] 19 | #define writel_be(__w, __addr) __raw_writel(__w, __addr) | ^ include/asm-generic/io.h:363:9: note: previous definition is here 363 | #define writel_be writel_be | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: In file included from arch/sparc/vdso/vdso32/../vclock_gettime.c:18: >> arch/sparc/include/asm/io.h:20:9: warning: 'writew_be' macro redefined >> [-Wmacro-redefined] 20 | #define writew_be(__l, __addr) __raw_writew(__l, __addr) | ^ include/asm-generic/io.h:351:9: note: previous definition is here 351 | #define writew_be writew_be | ^ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: arch/sparc/vdso/vdso32/../vclock_gettime.c:274:1: warning: no previous prototype for function '__vdso_clock_gettime' [-Wmissing-prototypes] 274 | __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts) | ^ arch/sparc/vdso/vdso32/../vclock_gettime.c:273:9: note: declare 'static' if the function is not intended to be used outside of this translation unit 273 | notrace int | ^ | static arch/sparc/vdso/vdso32/../vclock_gettime.c:302:1: warning: no previous prototype for function '__vdso_clock_gettime_stick' [-Wmissing-prototypes] 302 | __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts) | ^ arch/sparc/vdso/vdso32/../vclock_gettime.c:301:9: note: declare 'static' if the function is not intended to be used outside of this translation unit 301 | notrace int | ^ | static arch/sparc/vdso/vdso32/../vclock_gettime.c:327:1: warning: no previous prototype for function '__vdso_gettimeofday' [-Wmissing-prototypes] 327 | __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) | ^ arch/sparc/vdso/vdso32/../vclock_gettime.c:326:9: note: declare 'static' if the function is not intended to be used outside of this translation unit 326 | notrace int | ^ | static arch/sparc/vdso/vdso32/../vclock_gettime.c:363:1: warning: no previous prototype for function '__vdso_gettimeofday_stick' [-Wmissing-prototypes] 363 | __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz) | ^ arch/sparc/vdso/vdso32/../vclock_gettime.c:362:9: note: declare 'static' if the function is not intended to be used outside of this translation unit 362 | notrace int | ^ | static 29 warnings generated. vim +/readw_be +16 arch/sparc/include/asm/io.h 21dccddf45aae2 Jan Andersson 2011-05-10 9 21dccddf45aae2 Jan Andersson 2011-05-10 10 /* 21dccddf45aae2 Jan Andersson 2011-05-10 11 * Defines used for both SPARC32 and SPARC64 21dccddf45aae2 Jan Andersson 2011-05-10 12 */ 21dccddf45aae2 Jan Andersson 2011-05-10 13 21dccddf45aae2 Jan Andersson 2011-05-10 14 /* Big endian versions of memory read/write routines */ 21dccddf45aae2 Jan Andersson 2011-05-10 15 #define readb_be(__addr) __raw_readb(__addr) 21dccddf45aae2 Jan Andersson 2011-05-10 @16 #define readw_be(__addr) __raw_readw(__addr) 21dccddf45aae2 Jan Andersson 2011-05-10 @17 #define readl_be(__addr) __raw_readl(__addr) 21dccddf45aae2 Jan Andersson 2011-05-10 18 #define writeb_be(__b, __addr) __raw_writeb(__b, __addr) 21dccddf45aae2 Jan Andersson 2011-05-10 @19 #define writel_be(__w, __addr) __raw_writel(__w, __addr) 21dccddf45aae2 Jan Andersson 2011-05-10 @20 #define writew_be(__l, __addr) __raw_writew(__l, __addr) 21dccddf45aae2 Jan Andersson 2011-05-10 21 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
